these 3 derivations will be built:
  /nix/store/y5gphjnl8ki83q8anqwby00bmmr8lwgm-source.drv
  /nix/store/7d3glf2n365xna2lpmapfwm40v6dj3sa-collie-1.24.2.drv
  /nix/store/qycbi6bngsbwzz43ll1kifz5l3hz06rl-check-collie.drv